<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="style.css" />
    <title>手机端选项卡</title>
    <style>
      * {
        box-sizing: border-box;
      }

      body {
        background-color: rgba(155, 89, 182, 0.7);
        font-family: "Open Sans", sans-serif;
        display: flex;
        align-items: center;
        justify-content: center;
        height: 100vh;
        margin: 0;
      }

      .phone {
        position: relative;
        overflow: hidden;
        border: 3px solid #eee;
        border-radius: 15px;
        height: 600px;
        width: 340px;
      }

      .phone .content {
        opacity: 0;
        object-fit: cover;
        position: absolute;
        top: 0;
        left: 0;
        height: calc(100% - 60px);
        width: 100%;
        transition: opacity 0.4s ease;
      }

      .phone .content.show {
        opacity: 1;
      }

      nav {
        position: absolute;
        bottom: 0;
        left: 0;
        margin-top: -5px;
        width: 100%;
      }

      nav ul {
        background-color: #fff;
        display: flex;
        list-style-type: none;
        padding: 0;
        margin: 0;
        height: 60px;
      }

      nav li {
        color: #777;
        cursor: pointer;
        flex: 1;
        padding: 10px;
        text-align: center;
      }

      nav ul li p {
        font-size: 12px;
        margin: 2px 0;
      }

      nav ul li:hover,
      nav ul li.active {
        color: #8e44ad;
      }
    </style>
  </head>
  <body>
    <div class="phone">
      <img src="./images/home.jpeg" alt="home" class="content show" />
      <img src="./images/work.jpeg" alt="work" class="content" />
      <img src="./images/blog.jpeg" alt="blog" class="content" />
      <img src="./images/about.jpeg" alt="about" class="content" />
      <nav>
        <ul>
          <li class="active">
            <i class="fas fa-home"></i>
            <p>Home</p>
          </li>
          <li>
            <i class="fas fa-box"></i>
            <p>Work</p>
          </li>
          <li>
            <i class="fas fa-book-open"></i>
            <p>Blog</p>
          </li>
          <li>
            <i class="fas fa-users"></i>
            <p>About Us</p>
          </li>
        </ul>
      </nav>
    </div>
    <script>
      /* 
      第一步：获取元素
      获取所有类名为content的元素
      获取所有li 
      */
      const contents = document.querySelectorAll('.content')
const listItems = document.querySelectorAll('nav ul li')

      /* 
      第二步：遍历li添加点击后处理的事件函数
      1.移除所有content内容和导航栏按钮的show和active效果
      2.给点击到的li和对应的上方content内容区域添加对应的show和active效果
      添加点击事件的方法为
      node.addEventListener("click", function () {
          要执行的操作
        });
      */
      listItems.forEach((item, idx) => {
    item.addEventListener('click', () => {
        hideAllContents()
        hideAllItems()

        item.classList.add('active')
        contents[idx].classList.add('show')
    })
})
     
      //移除所有content的show效果
      function hideAllContents() {
    contents.forEach(content => content.classList.remove('show'))
}

      //移除所有item的active效果
      function hideAllItems() {
    listItems.forEach(item => item.classList.remove('active'))
}


    
    </script>
  </body>
</html>
